Dear support, 

I'm having some issues with displaying the FilterOperand dropdown from the custom filter dialog which is opened from the column icon from the UltraGrid (version 13.1) in my application.

When I open the custom filter dialog and select FilterOperator=Equals to some FilterOperand, then hit OK, the data from the grid disappears.

When I open again the custom filter dialog I get this(the column name is prepended to the FilterOperand value):

I could not locate the event where I can catch when and why the FilterOperands are populated. I need your directions on this. What should I check?

best regards,
Vane