Select with groups?

Hello, i have a Problem. 

In the draft below you can see some red and blue squares. The red ones should show my groups. In DraftSight you don't see this of course, but its better for explaining.

The Problem: If i like to select the railing above the 3 groups i use the mouse and draw a frame (the blue one). Instead of just the railing, everything (except the stairs) is selected now.

Is there a setting in DraftSight, which tells the programm just to select groups if they completely "framed"? 

 

Normaly you can choose the method by taking the frame from left to right (completely) or from right to left (crossing mode). But with groups it doesn't work?