Improvement needed on "Attach controls" function for splitter controls

[RobertoBozzolo]

Attaching controls to a splitter in the UIR editor can be a pain if the panel has several controls on it. I'll make an example using CVI example SendMail: trying to add a vertical splitter and attach all controls to it in order to rearrange the panel when the user resizes it. This is the original panel, you can see the vertical splitter in the upper right corner:

First of all, if several controls are selected, they overlap in the right panel of the editor in a way different from the original panel. Here you can see that the decoration indicated by the arrow overlaps two string controls that I'm not able to operate on to select desired  attachment mode. This means that I need to proceed to attach controls in steps, hoping new controls added are not overlapped by previous ones. Alternatively I can move controls in the right panel to encover hidden ones, but this ingenerates confusion as controls are no more in the original position besides being a waste of time.

Second item: if selected controls are on the "wrong" side of the panel, they are all grouped (and possibly overlapped) on the closest boundary of the right window. See this example: Send and Quit buttons are only partially visible on the lower left corner of the right window and additionally they are overlapped (in the small box how they appear if I select one of them and move it upwards):

I suggest that this function is improved with these additions:

• Honour the z-plane order of the original panel when controls are selected for attachment and moved to the right side
• Maintain original controls position when moved to the right panel. Consequently:
• Have both scrollbars enabled in Controls on the Splitter window in order to navigate to the controls; at present only one of them is enabled, whether vertical or horizontal depending on the type of splitter