How to get not truncated text from IUITextField

I have created a custom column header renderer for my AdvancedDataGrid which has a text and a little button inside. Everything works just fine, until a moment when I have to return a he开发者_JAVA技巧aderText by the button click.

Since my custom renderer is an extention of AdvancedDataGridHeaderRenderer it has inherited property label which is IUITextField. So, when I call label.text from inside the custom renderer I get only truncated text, but I need the original one.

Any idea how to get not truncated text from IUITextField? Or maybe the original text is stored somewhere else and I am looking in a wrong place?

You can read the header text from the headerText property of the corresponding AdvancedDataGridColumn