Putting a DialogBox into a DLL?

Can you put a DialogBox into a DLL? I need for my DLL's to be able to control some of their internal parameters during debuging stages and id like to be able to pull up a dialog box and just change their values. I tried just putting one in, and exporting a method that calls DialogBoxParams but it just causes the program to close.

Code:

// from Batch.h
extern "C" DLLAPI void ParamDialog(const HINSTANCE& hInstance, const HWND& hParent);
//Pre:
//Post:

INT_PTR	CALLBACK DialogProc(HWND hwndDlg, UINT Msg, WPARAM wParam, LPARAM lParam);
//Pre:
//Post:

//from Batch.cpp
void ParamDialog(const HINSTANCE& hInstance, const HWND& hParent)
{	int iDlg = ::DialogBoxParam(hInstance,
		                            MAKEINTRESOURCE(IDD_DIALOG1),
		                            hParent,
			            DialogProc,
			            NULL);
}

Ok, i figured out why the program was closing, but now it wont load the Dialog. I mean it loads the DLL fine. Loads the function fine. But when I call the DialogParam function nothing happens, nothing is displayed. I made sure to have the Dialog visible in its properties.