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saving Collapse/Expand state of child grid
posted

We have a WebHierarchicalDataGrid with child grid and a date picker. The user can expand or collapse the child grid by clicking the arrow on the left.  See below sceenshot.   What we need to do is whenever the user picks a date, the grid will refresh. But we want to save the state of collapse/expand  when the grid refresh, i.e.  if the user collapsed the grid and select a different date,  after refresh, the grid should remain collapsed...  

I wonder how to achieve that.  I can't find any event to detect the event of collapsing or expanding the grid.  The OnRowExpanded event only works for the initial loading of the grid.   Thanks