Descriptive Problem Summary:
Adding a control at runtime into a pane that has been scrolled, or using winset() to read the control's pos parameter, produces wrong results.
Numbered Steps to Reproduce Problem:
1) Create scrollable pane control
2) Scroll pane control
3) Add control to pane; its position will be further right/down than it should be--it is positioned as if the pane is not currently scrolled.
4) Use winget() to read control's pos parameter; it will return a value left/up from what it should be--as if the pane is not currently scrolled.
The pos parameter should place new controls, and return the position of existing controls, relative to the logical origin of the pane instead of the physical origin.
The pos parameter is always calculated relative to the pane's physical origin.