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If you are not dragging your control over a group control, this means your control will be placed at the top of your form. Anywhere to the right of the print  icon is a droppable area.  

•   This means your tab or table column will move to the right of the tab or table column on which it is being dropped. This applies only The Image Added icon only applies to tab and table controls.

Other important drag-and-drop rules:

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