Programmatically adding action to button

Question

I have tried to programmatically add javascript to an Acrobat button, as follows (using APToolkitNet):
FieldInfo fi = toolKit.FieldInfo( "ButtonX" ,1 );
fi.MouseUpScript = "app.alert('hello world')"; //OR
fi.JavaScript = "app.alert('hello world')";
I run my code, and this script does get added to my form javascripts. The problem is, they are being added as being a type of Calculation, as follows:
//<AcroForm>
//<ACRO_source>ButtonX:Calculate</ACRO_source>
//<ACRO_script>
/*********** belongs to: AcroForm:ButtonX:Calculate ***********/
app.alert('hello world')
//</ACRO_script>
//</AcroForm>
When it should be (i.e. this is what occurs when you manually add the javascript):
//<AcroForm>
//<ACRO_source>ButtonX:Annot1:MouseUp:Action1</ACRO_source>
//<ACRO_script>
/*********** belongs to: AcroForm:ButtonX:Annot1:MouseUp:Action1 ***********/
app.alert('hello world')
//</ACRO_script>
//</AcroForm>
Can anyone help me???
Thanks

Answer 1

Since Acrobat supports 4 mouse actions, you will have to find out how to differentiate between the "Mouse Enter", "Mouse Down", "Mouse Up", and "Mouse Exit" actions. The vendor should have provided documentation or can provide the information.