Brandon, Thanks for the answer. I likewise set a breakpoint and found the marks cleared before I ever got to the events and the stack did not show any obvious point at which it happens. Unless I am wrong the behavior is baked into the base grid control and was the reason MS developed the selection list enhancement. Since this behavior is all over it is impractical to modify every grid. Another loss in function from AX 2009. By and large the AX UI took a big usability hit in 2012. The click a button simplicity is gone. 2012 appears to be the stepson of Office and Windows Vista.
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