Limit List-box displayed entries

Hi.
This is the story:
I have created a Dialog scren and defined a field (let's call it FieldA) based on db field (e.g. PA0001-PERSG).
Now since the db field has Check-table, FieldA has F4 functionality attached.
Since I don't fancy the F4 functioanality (it takes too long to come up and a lot of resources) I changed FieldA type to "Listbox".
Now all the values that would appear in the F4 screen are showing as a List-box (AKA Drop-down or Combo-box).
So far so good, but the problem is this:
I don't want all the possible entries in my List-box, just a few.
I know how to control it in the F4 but not as a List-box.
Any ideas anyone?
Regards.
Ayal.

Hi....
Why should u r not trying this...
In the PAI event of that screen...
> FIELD F1 MODULE create_dropdown_box.
And in that module....
>MODULE create_dropdown_box INPUT.
>
> TYPE-POOLS : vrm.
>
>
> DATA : BEGIN OF f1_info OCCURS 0 ,
>               f1_ac(20) ,
>         END OF f1_info .
>
> DATA : vid TYPE vrm_id.
> DATA : itab1 TYPE vrm_values,
>              itab_1 TYPE vrm_value .
>
> REFRESH f1_info.
>
>    f1_info-f1_ac = 'ENTRY1' .
>    APPEND f1_info .
>
>     f1_info-f1_ac = 'ENTRY2' .
>    APPEND f1_info .
>
>     f1_info-f1_ac = 'ENTRY3' .
>    APPEND f1_info .
>
>   vid = 'F1'.
>
> LOOP AT f1_info.
>    itab_1-key = f1_info-f1_ac .
>    itab_1-text = f1_info-f1_ac .
>    APPEND itab_1 TO itab1.
> ENDLOOP.
>
>
> CALL FUNCTION 'VRM_SET_VALUES'
>    EXPORTING
>      id                    = 'F1'
>      values                = itab1
> EXCEPTIONS
>    ID_ILLEGAL_NAME       = 1
>   OTHERS                = 2
>            .
> IF sy-subrc <> 0.
> MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
>          WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
>   ENDIF.
>
> REFRESH itab1.
>
> ENDMODULE.                 " create_dropdown_box INPUT
Here actually iam used hard coding.. for entries..its good for less than 5 or 6 entries...
You can modify code according to ur requirement...
and get back to me if u want any clarification on this...
Thanks,
Naveen.I
Edited by: Naveen Inuganti on Jul 1, 2008 11:16 AM

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Right, I have asked many people on IRC and no one is giving me a straight answer lol so maybe some professionals can help me.
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it was built procedurally?
Anyway here is some code for reference:
// Windows Form
namespace skbtInstaller
public partial class frmMainWindow : Form
public frmMainWindow()
InitializeComponent();
// coxArmaPath = Combo Box (simple drop down)
this.cBoxArmaPath.ValueMember = "Key";
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// This acts differently with the same types???
public void setServerPathDatasource(List<KeyValuePair<String, String>> source)
this.cBoxArmaPath.DataSource = new BindingSource(source, null);
public class skbtServerControl
private frmMainWindow frmMainWindowHandle;
public void refreshformWindow()
// Clear Drop Box (empties drop box)
this.frmMainWindowHandle.clearPathBox();
//skbtServerConfig is very simple property object
foreach (KeyValuePair<String, skbtServerConfig> pair in CoreConfig.getServerConfigList())
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// ** HERE IS THE PROBLEM?? **
// This creates a type that seems different to the above function which works fine...
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// ????? surely this function should act exactly like the function above??
Thanks!
(I have posted on codeproject too, will condense any replies).

Thanks Michael!
I did debug this and it turns out when i set a new BindingSource to the combo box, indeed the DisplayMember gets reset. Oddly though, the ValueMember stays the same.
I have fixed this with setting the Members before every new bindingSource is set to the combobox, strange that only the displaymember is reset?
For reference, the new resolved code: (this compiles albeit with designer components placed)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace etstapp1
public partial class Form1 : Form
private skbtServerControl sc;
public Form1()
InitializeComponent();
this.sc = new skbtServerControl(this);
// coxArmaPath = Combo Box (simple drop down)
this.cBoxArmaPath.ValueMember = "Key";
this.cBoxArmaPath.DisplayMember = "Value"; // This doesnt seem to stick after the first datasource set??
public void addServerPathItem(String Key, String Value)
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private void btnNormal_Click(object sender, EventArgs e)
this.sc.refreshFormWindow();
private void btnDynamic_Click(object sender, EventArgs e)
this.sc.refreshformWindowWithDatasource();
public class skbtServerControl
private CoreConfig CoreConfig;
private Form1 frmMainWindowHandle;
public skbtServerControl(Form1 f){
this.frmMainWindowHandle = f;
this.CoreConfig = new CoreConfig();
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this.frmMainWindowHandle.clearPathBox();
//skbtServerConfig is very simple property object
foreach (KeyValuePair<String, skbtServerConfig> pair in CoreConfig.getServerConfigList())
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this.frmMainWindowHandle.addServerPathItem(pair.Key, pair.Value.getTextualName()); // this works as intended
// cBox gets items like: Some Display Text, Some Display Text, Some Display Text (PERFECT!)
// This works absolutely fine. ValueMembers are hidden.
public void refreshformWindowWithSTATICDatasource()
// Clear Drop Box
this.frmMainWindowHandle.clearPathBox();
var pathDataSource = new List<KeyValuePair<String, String>>()
new KeyValuePair<String, String>("testKey1", "somevalue1"),
new KeyValuePair<String, String>("testKey2", "somevalue2"),
new KeyValuePair<String, String>("testKey3", "somevalue3")
// Populate Drop Box
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// cBox gets items like: Some Display Text, Some Display Text, Some Display Text (PERFECT!)
// ** HERE IS THE PROBLEM?? **
// This creates a type that seems different to the above function which works fine...
public void refreshformWindowWithDatasource()
// Clear Drop Box
this.frmMainWindowHandle.clearPathBox();
var pathDataSource = new List<KeyValuePair<String, String>>();
//skbtServerConfig is very simple property object
foreach (KeyValuePair<String, skbtServerConfig> pair in this.CoreConfig.getServerConfigList())
pathDataSource.Add(new KeyValuePair<String, String>(pair.Key, pair.Value.getTextualName()));
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// ????? surely this function should act exactly like the function above??
public class CoreConfig
public Dictionary<String, skbtServerConfig> getServerConfigList(){
return new Dictionary<string, skbtServerConfig>()
{"somekey1", new skbtServerConfig("somename1")},
{"somekey2", new skbtServerConfig("somename2")}
public class skbtServerConfig
private String name;
public skbtServerConfig(String name)
this.name = name;
public String getTextualName()
return this.name;
Talking with someone it seems logical that every time I set a new BindingSource the component will not know if I want to keep the same member values so it resets them, but why it only resets displaymember? very strange to me.
Thanks again.

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