Very many bug fixes. Highly recommend steering clear of the last version.
"Strict Selection" set to false seems to work fine now.
Margins may still need some work (whether or not the mouse highlights buttons when entering the margin area is still inconsistent)
Right now, grids need a fixed size container in order to be built, so if a grid is a child of another grid with the parent grid's column/row set to "Auto", it will be changed to "Fill" so that the child grid can be built with a fixed size.
This may later be resolved by adding a new method "BuildGridVariableSize" where every "Fill" column/row in the child grid is set to a size of zero, and the parent grid is then given the total size to continue with the "Auto" column/row calculation.
Don't worry, it makes sense in practice.