Hello TANSERI,
You can try to set the text of the second RadComboBox to an empty string.
Please take a look at
this online demo. At the
OnClientSelectedIndexChanging event of the RadComboBox1 the text of the RadComboBox2 is set to empty string and items are cleared if there is no item selected at the RadComboBox1.
Regards,
Kalina
the Telerik team