I tried the advice, but failed to see any improvement.
LAYOUT_FIX_HEIGHT did not work, and cbo.children[0] refers FXWindow,
not FXTextField, where killSelection is defined.

I must have found a weak spot of FXRuby. The combobox is used for 
selecting a string in 90% of all cases. The default behaviour of 
FXComboBox is text editing and substring selection.

I've tried to find the source code, but failed.

Christer

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