Hello Loy Chan,
Thank you the question.
Currently, in order to get the TextBoxItem expanded, you should set its MinSize
as well. Please refer to the following code snippet:
|this.radComboBoxElement1.MinSize = new Size(150, 0);
|this.radComboBoxElement1.TextBoxElement.Children.MinSize = new Size(this.radComboBoxElement1.Size.Width - 22, 0);
I hope this helps. If you have additional questions, feel free to contact me.
All the best,
the Telerik team
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