OnSaveChanges is not called when moving from one cell to another using GDBG 1.6.1.8

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Hi, I created a custom renderer and model. I use a syncfusion GDBG 1.6.1.8 My renderer OnSaveChanges() is never called when I move from a cell to another but it does get called when I click on another control outside the grid. I followed one of the sample code provided with the grid. What is wrong ? Thanks BasisPointTextBox_72.zip