>>1. The initial display of the grid doesn't show the InputMask, only after I click on the grid.
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>>2. The highlight doesn't properly work for this column. (I use HiglightStyle = 2)
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>Works fine for me, I suspect you have changed some value which disables the default behavior.

I have column's sparse set to .f. and I actually use my grid (subclass of the base grid class).