An approach you can use to set the ToolBar to visible or invisible is to set its CssClass
property. So when you want to make it invisible you can set the following custom class:
and when you want to make it visible again the following one:
You will have to add the corresponding CSS rules which will set the visibility depending on the ToolBar's currently set custom class:
For accessing the ToolBar you can see this
forum thread, where it is shown how to access a control placed in a Grid's CommandItemTemplate.
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