Need to place the cursor to the end of text when the dialog box is opened.

hai all,

I need to place the cursor to the end of the text in a text field. when user open a dialog box, the field will contain some default value. I need to place the cursor to the end of text in the field, so that user can enter the text directly with out moving the cursor to the end of the text.  can any one help me regarding this. i need to do this in axapta 2009.

thanks and regards 

jismon