click -- select control (collection is maintained)
shift+click -- toggle mark on control
ctrl+click -- activate script (ctrl+click script to return)
double-click -- show Control Dialog
drag move -- drag collection. Ctrl+shift to move just the selection.
drag resize -- just outside the red border shows a resizing cursor. Ctrl+shift to resize just the selection.
draw select -- press the mouse outside any control and draw a box to select controls
A mouse action in a marked control affects that control. To select a control covered by a marked control, first unmark the control. The mouse selects the control with the nearest upper left corner.
The mouse displays the form menu. Select a menu item with Ctrl to activate the script.
If tab order is displayed mouse actions are different.