Thank you for writing.
Changing of the height of the ComboBoxItem can be done with the following code snippet:
This code will change only the height of the first item.
If you want to show the horizontal scroll bar in the combo popup, you should change its state by using the following code snippet:
.radComboBox1.ComboBoxElement.ComboPopupForm.ListBox.HorizontalScrollState = ScrollState.AutoHide;
Changing the selection color is possible only by changing the theme. Follow the instructions on how to create a theme for the combo box in the documentation of the VisualStyleBuilder
. I am sending you the default theme files. You could load it in the VisualStyleBuilder and change the selection fill of the ListBox control. After that you should apply it on the RadComboBox. I hope this will helps.
If you have additional questions, feel free to ask.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.