Hi JustinWong,
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:
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.
Kind regards,
Dobry Zranchev
the Telerik team
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