Error Message:
----------------------------------------
Invalid variant type conversion

[00405B74] System.VarChangeType + $98
[00405CBA] System.@VarCast + $EA
[00405CF9] System.@VarToInt + $35
[00FB104F] NewFieldsFm.TNewFieldsFrame.GRDblClick (Line 2412, "Frames\NewFieldsFm.pas" + 12) + $2
[00455269] Controls.TControl.DoMouseDown (Line 4306, "Controls.pas" + 2) + $21
[00455325] Controls.TControl.WMLButtonDblClk (Line 4331, "Controls.pas" + 5) + $C
[00947C78] dxTL.TCustomdxTreeList.WndProc (Line 9513, "dxTL.pas" + 47) + $4
[0044402C] Forms.StdWndProc (Line 1459, "Forms.pas" + 8) + $0
[0044D83B] Forms.TApplication.ProcessMessage (Line 6630, "Forms.pas" + 13) + $1
[010B0664] IBExpert.IBExpert (Line 944, "D:\Projects_5\IBExpert\IBExpert.dpr" + 156) + $7