Syntax
#(proc,%combobox.selection-changed,...)
%combobox specifies a combobox control. You can define this to be a proc which gets called when the selection changes on the combobox control.
Example
Def:ComboBox:example-panel.my-combobox(200,100) [*][*] Def:Proc:example-panel.my-combobox.selection-changed [*] #(example-panel.my-combobox.selection) [*]