How can I change a Button Text(or caption) in my ocx??

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buttons

BEGIN_DISPATCH_MAP(CEM_OptionCtrl, COleControl)
//{{AFX_DISPATCH_MAP(CEM_OptionCtrl)
DISP_STOCKPROP_BACKCOLOR()
DISP_STOCKPROP_FORECOLOR()
DISP_STOCKPROP_ENABLED()
DISP_STOCKPROP_TEXT()
//}}AFX_DISPATCH_MAP
END_DISPATCH_MAP(

After add a Text Stock property, and I tried to change a Text.

I think that OnTextChanged() mathod should be modified.

But I don't know how I can make it. Help me!! Plz~

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Thnak u for answer.
I miss how I provide the property to a person who use it.
My ocx will be used visual basic, and text property will be modified
property sheet.
So I shoud use another way.
Help me!!
thank you!