PROBLEM After upgrading Radtreeview 5.0.x to v5.1 all of the RadTreeViews in the project show "Error Creating Control" in design view and "Unknown Server Tag Radt:Treeview" error when you hover over the control.SOLUTIONFor consistency among all RadControls, the name of the treeview is changed in terms of case-sensitivity - in v5.0 it was RadTreeView while in 5.1 it is RadTreeview. Depending on your VS.NET settings, this may produce the above errors.To solve the problem, change the control registration tag manuallyfrom:<%@ Register TagPrefix="radT" Namespace="Telerik.WebControls" Assembly="RadTreeView" %>to<%@ Register TagPrefix="radT" Namespace="Telerik.WebControls" Assembly="RadTreeView" %>If this does not fix the issues, please start a support ticket and send us a sample subset of your project reproducing this issue.
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