private void InitDialog(IntPtr hWnd) { m_hWnd = hWnd; var hParent = hWnd.GetParent().AssumeNonZero(); hParent.SetWindowSubclass(m_openFileSubClassDelegate, 0, 0); //disable and hide the filter combo box var hFilterCombo = hParent.GetDlgItem(InteropUtil.ID_FilterCombo).AssumeNonZero(); hFilterCombo.EnableWindow(false); hParent.SendMessage(InteropUtil.CDM_HIDECONTROL, InteropUtil.ID_FilterCombo, 0); hParent.SendMessage(InteropUtil.CDM_HIDECONTROL, InteropUtil.ID_FilterLabel, 0); //update the file name label var hFileNameLabel = hParent.GetDlgItem(InteropUtil.ID_FileNameLabel).AssumeNonZero(); if (FileNameLabel != "") { hFileNameLabel.SendMessageString(InteropUtil.WM_SETTEXT, 0, FileNameLabel); } //find the button controls in the parent var hOkButton = hParent.GetDlgItem(InteropUtil.IDOK).AssumeNonZero(); var hCancelButton = hParent.GetDlgItem(InteropUtil.IDCANCEL).AssumeNonZero(); //We don't want the accelerator keys for the ok and cancel buttons to work, because //they are not shown on the dialog. However, we still want the buttons enabled //so that "esc" and "enter" have the behavior they used to. So, we just //clear out their text instead. hOkButton.SetWindowTextW(""); hCancelButton.SetWindowTextW(""); //find our button controls var hSelectButton = hWnd.GetDlgItem(InteropUtil.ID_SELECT).AssumeNonZero(); var hCustomCancelButton = hWnd.GetDlgItem(InteropUtil.ID_CUSTOM_CANCEL).AssumeNonZero(); //copy the font from the parent's buttons hSelectButton.LoadFontFrom(hOkButton); hCustomCancelButton.LoadFontFrom(hCancelButton); var cancelLoc = hCancelButton.GetWindowPlacement(); //hide the ok and cancel buttons hParent.SendMessage(InteropUtil.CDM_HIDECONTROL, InteropUtil.IDOK, 0); hParent.SendMessage(InteropUtil.CDM_HIDECONTROL, InteropUtil.IDCANCEL, 0); //expand the file name combo to take up the space left by the OK and cancel buttons. var hFileName = hParent.GetDlgItem(InteropUtil.ID_FileNameCombo).AssumeNonZero(); var fileNameLoc = hFileName.GetWindowPlacement(); fileNameLoc.Right = hOkButton.GetWindowPlacement().Right; hFileName.SetWindowPlacement(ref fileNameLoc); var parentLoc = hParent.GetWindowPlacement(); //subtract the height of the missing cancel button parentLoc.Bottom -= (cancelLoc.Bottom - cancelLoc.Top); hParent.SetWindowPlacement(ref parentLoc); //move the select and custom cancel buttons to the right hand side of the window: var selectLoc = hSelectButton.GetWindowPlacement(); var customCancelLoc = hCustomCancelButton.GetWindowPlacement(); m_cancelWidth = customCancelLoc.Right - customCancelLoc.Left; m_selectWidth = selectLoc.Right - selectLoc.Left; m_buttonGap = customCancelLoc.Left - selectLoc.Right; var ctrlLoc = hWnd.GetWindowPlacement(); ctrlLoc.Right = fileNameLoc.Right; //ResizeCustomControl(hWnd, fileNameLoc.Right, hCustomCancelButton, hSelectButton); ResizeCustomControl(hWnd); }