Hello Faithful Eli,
I would like to clarify that RadDropDownList internally hosts TextBox control. When you hover the dropdownlist control the MousEnter is invoked and then the mouse captures the hosted text box control. This results in firing the MouseLeave event of the control and MouseEnter event of the hosted text box. This is why I can suggest handling the mouse events of the text box control:
this.radDropDownList1.DropDownListElement.TextBox.TextBoxItem.HostedControl.MouseEnter += this.HostedControl_MouseEnter;
private void HostedControl_MouseEnter(object sender, EventArgs e)
You can refer to the following forum thread as well that might be useful: https://www.telerik.com/forums/how-to-change-dropdownlist-colors-and-style
However, if you are experiencing any further difficulties I would kindly ask you to provide more information about the exact scenario that you are trying to achieve. Thus, we will be able to think of a suitable solution and assist you with this case.
I hope this information is useful. Do not hesitate to contact me if you have other questions.
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