Selecting Quadrants in Map Source

[DaleBryant]

Is there a faster way of selecting larger selections of a topo in Map Source?
Shift click doesn't work.  I've tried dragging to no avail.

Any other ideas?
Thanks,
Dale

[maps4gps]

Placing the selection tool over a tile/quad in one corner of an area of interest, then holding the left mouse button, then draging to the diagonal corner is working for me.  You can delete individual selected quads from the 'selected box' at the left, if you do not need all the quads in a rectangular area.

[DaleBryant]

Thanks so much.
The trick is to drag diagonally.