We enable the "Select Objects" feature (Home Tab Find & Select), but can
never select multiple activeX controls (checkboxes) by dragging the mouse.
The selection extent (marquee) can be dragged around the objects, but it
will not select them. The selection pane option is no better because we
cannot drag over multiple selections, nor manually extend (SHIFT-Select)
selectons, in the selection pane either.

The only way we can make multiple selections is by CTRL-Selecting objects on
the worksheet or in the selection pane. Any suggestions why we cannot
drag-select our controls?