By default, True DBGrid for WinForms uses a down arrow for the in-cell button. 
However, the button bitmap can be changed for a C1DisplayColumn object at design time by setting the ButtonPicture property in code:
To write code in Visual Basic
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Me.C1TrueDBGrid1.Columns(0).ButtonPicture = System.Drawing.Image.FromFile("dollar.bmp")
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To write code in C#
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this.c1TrueDBGrid1.Columns[0].ButtonPicture = System.Drawing.Image.FromFile("dollar.bmp");
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The grid automatically draws the edges corresponding to the button's up/down states as appropriate, so only the interior image of the button needs to be provided.
