Is there a reason you can't use a dockable form?

>Hi All.
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>Is there a way to allow a user to resize a toolbar? For instance, if I put a grid or a listbox on a toolbar can the user resize that toolbar to show more rows? Currently the toolbar will not allow me to resize it even though the mouse cursor changes shape to indicate a resize operation is possible.
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>Also, if the toolbar gets docked on the left or right sides of the screen how can I automatically adjust the toolbar to stretch the total height available in order to maximize the visible rows of the contained grid or listbox?
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>Thanks