How to change the attributes of a ComboBox in BC++ 5.0 ?

When i do something like that :

TMyComboBox * Combo=new TMyCombobox(0,ID_MyCombo, 0, 0, 180, 150, SMAX);
Combo->Attr.Style &= ~WS_TABSTOP;

Control=new TControlGadget(*Combo);

//ControlBar is a TControlBar pointer...

It make an Fatal error reading to adress XXX...
I've tried on the TMyComboBox constructor an on the SetupWindow function, but it do again the same error or it doesn't change anything...
Is there any other method to change those attributes ?

I need just to take off the WS_TABSTOP style ...

PS - Excuse-me for my english, i'm french !
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edtmihuConnect With a Mentor Commented:
I tried in one of my apps. I also have a combobox in the controlbar. It works for me. I think the problem lies somewhere else.
However, another way of changing the style of a window is
SetWindowLong(...) and GetWindowLong(..)
For example:
DWORD dwStyle = GetWindowLong( *Combo, GWL_STYLE );
dwStyle &= ~ WS_TABSTOP;
SetWindowLong( *Combo, GWL_STYLE, dwStyle );
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