How to show Dialog Box front of application

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C++

Hi,
I have one Software that make for that API in dll format.
When run software API open one Dialog and ask for "Username" & "Password".
Problem is when I start software instead it show dialog front of software screen, shows on Toolbars and subwindow of software.

For create dialog I using CreateDialogParam function.

Use below code to create Dialog:

hDlg = CreateDialogParamA(g_hInstance, MAKEINTRESOURCE(IDD_DIALOG1 ), hWnd, DialogFunc, 0);

For hWnd I using value that software send to dll.

INT_PTR CALLBACK DialogFunc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HMENU hMenu;
	
	switch(uMsg)
	{
	case WM_INITDIALOG:
		read(f1);
		read1(f2);
			
		hDlg1=GetDlgItem(hDlg,IDC_EDIT1);
		SetWindowTextA(hDlg1,UserSaved);
		hDlg2=GetDlgItem(hDlg,IDC_EDIT2);
		SetWindowTextA(hDlg2,PWDSaved);
		break;
	case WM_COMMAND:
		switch(LOWORD(wParam))
		{
		case IDC_BUTTON2:
			char buff1[1024];
			char buff2[1024];
			char buff3[1024];
			
			hDlg3=hDlg;
			
			GetWindowText(hDlg1,username,1024);
			write(f1);
			GetWindowText(hDlg2,key,1024);
			write1(f2);
			if(memcmp(Get_Account_Number_FromWEB(),b1,sizeof(b1))==0 ){result=1; DestroyWindow(hDlg);}
			else MessageBox(0,TEXT("Wrong User or PWD"),0,0);
		  
			break;
			case IDC_BUTTON3:
				DestroyWindow(hDlg);
				break;
				case IDC_EDIT1:
		         break;
			case IDC_EDIT2:
              break;

		}
		break;
	case WM_CLOSE:
		SetWindowLongA(hDlg, GWL_WNDPROC, dwNewLong);
		DestroyWindow(hDlg);
		return TRUE;
		break;
	
	}
	return FALSE;
}

How to set this Dialog shows in front of software screen and not side of screen?
Regards,