ShortCut Handler in asp.net textbox using jquery

ShortCut Handler in asp.net textbox using jquery

hi,
     I have an asp.net text box with text mode is multiline and listbox. In that listbox shortcut with expansion of shortcut.. for e.g app-Apple,ba-Ball upto Z... when i enter the character in textbox that time select the listbox options based on the textbox letters and press the shift and ` symbol get the full expansion in listbox.
     The textbox is the multi line so whenever type the words and it should select the options in the listbox and press shift and ` symbol get the full expansion. Please give any idea or code.