How to block lead selection change in a tree ?

Hi Guys,
Scenario
I have MasterTree - DetailEditor pair. MasterTree is used to visit some tree-structured data and DetailEditor is used to edit currently selected tree node.
Requirement
If currently selected node data is updated through DetailEditor and needs to be saved, than on a subsequent tree selection change the user should be warned about unsaved data.
Implementation
In onAction event handler of MasterTree I check whether last selected node data is updated and needs to be saved and if this is the case rollback treeSelection to that node. On the time onAction event handler is called the tree selection is changed from the node that needs save to the newly selected node. In order to rollback treeSelection I need to introduce variable referencing last selected tree node.
Question
Is there any other technique to implement above scenario without using additional variable and manually rollback treeSelection ? For example, to plug in WDP framework on validation step just before lead selection is changed.
Thanks in advance

Alex,
Here is a link to the phase model of WD:
http://help.sap.com/saphelp_nw04/helpdata/en/b8/cd96edb9c8794aa362e6e8b4236a1f/frameset.htm
There aren't any hooks provided prior to the event handlers being called. As far as I can tell, the way you are handling it is the only way that will work.
-Cindy

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I would like to build a similiar wd-application like wd-component 'wdt_master_detail'. There you will see a table with fly-data and below some details of the actual selected row of the table (by lead selection).
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added 1:
I have an assumption why it does not work:
Maybe z_table and z_detail instantiates two separate z_model.
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added 2:
I thinking further a little bit loud...
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Message was edited by: Marcel Schreier

Hi Marcel,
to extend Thomas comments, here are some suggestions to turn it into code. Hope it helps.
option A)
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option B)
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DATA lr_usage    TYPE REF TO    if_wd_component_usage.
DATA lr_if_ctr_z_table TYPE REF TO iwci_z_table.
DATA lr_if_ctr_z_detail TYPE REF TO iwci_z_detail.
DATA lr_model_usage    TYPE REF TO    if_wd_component_usage.
*-- create instance of z_model
lr_model_usage =   wd_this->wd_cpuse_usage_z_model( ).
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lr_usage =   wd_this->wd_cpuse_usage_z_table( ).
IF lr_usage->has_active_component( ) IS INITIAL.
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lr_if_ctr_z_table =   wd_this->wd_cpifc_usgae_z_table( ).
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lr_usage =   wd_this->wd_cpuse_usage_z_detail( ).
IF lr_usage->has_active_component( ) IS INITIAL.
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*-- set usage
lr_if_ctr_z_detail =   wd_this->wd_cpifc_usage_z_detail( ).
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regards, Ulli

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