Bitmap Control Attribute
If this bit is not set, the text in the control is specified in the Text column of the Control table.
To set this attribute on a control, include the Bitmap bit in the Attributes column of the control's record in the Control table.
The Text column in the Control table is used as a foreign key to the Binary table, therefore the control cannot contain both an icon image and text.
Do not set both the Icon and Bitmap bits.