Building two windows with similar definitions

Assume your application needs two windows with similar definitions. One window, w_employee, needs:

A title (Employee Data)
Text that says Select a file:
A drop-down list with a list of available employee files
An Open button with a script that opens the selected file in a multiline edit box
An Exit button with a script that asks the user to confirm closing the window and then closes the window

The window looks like this:

Shown is a sample window with the title Employee Data, the text Select a file:, a drop down list box, and next to it, and Open button. At bottom is a rectangular box for editing script and an Exit button.

The only differences in the second window, w_customer, are that the title is Customer Data, the drop-down list displays customer files instead of employee files, and there is a Delete button so the user can delete files.

Your choices

To build these windows, you have three choices:

Build two new windows from scratch as described in “Building a new window”
Build one window from scratch and then modify it and save it under another name
Use inheritance to build two windows that inherit a definition from an ancestor window

Using inheritance

To build the two windows using inheritance, follow these steps:

Create an ancestor window, w_ancestor, that contains the text, drop-down list, and the open and exit buttons, and save and close it.

You cannot inherit a window from an existing window when the existing window is open, and you cannot open a window when its ancestor or descendant is open.
Select File>Inherit, select w_ancestor in the Inherit From dialog box, and click OK.
Add the Employee Data title, specify that the DropDownListBox control displays employee files, and save the window as w_employee.
Select File>Inherit, select w_ancestor in the Inherit From dialog box, and click OK.
Add the Customer Data title, specify that the DropDownListBox control displays customer files, add the Delete button, and save the window as w_customer.