Eliminated the BorderColor variable from DrawMButton Sub.

Because it was not used
Normalization of lower case 'y' variable

To avoid accidentally change the case afterwards.
Added *.bak to the ignore list
Applied Fixes suggested by Kbre on cwProgressBar.cls, to correct the calculation of relations between mValue and mMax/mMin.
Made cfPopUp.cls a Public Class (visible on the vbWidgets-interface)
Added cDataSource_Move Event-Handling into cwDropDownList.cls.
Unified the DataSource-Handling to a common scheme in all Widgets, which can use DataSources so far.
Added Backspace-Key handling

Selects the current Parent-Node, from anywhere in the current child-selection
Changed BackKey-Handling in cwTree.cls to remain at the current selection, in case no ParentNode exists.
avoid an unnecessary flicker-occasion when a ListCount-Change forces an Refresh on cwVList.cls
Added AlternateRowColor to cwGrid.cls