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Extra info for MegaFox: 1002 Things You Wanted to Know About Extending Visual FoxPro
Be careful to write optimized code in these methods; otherwise, you will see performance issues when activating a project. Also note that the project gets activated/deactivated quite frequently. Using the Project Manager to open any of the items that it contains deactivates the project. Closing the editor or designer reactivates the project if it is next in the window stack. Another gotcha! to be aware of when writing code in the Activate() method is displaying a message via the MESSAGEBOX() function.
This class has a style of 0-Dropdown Combo, so users can type into the textbox portion of the control to add new entries to its RowSource. In order to prevent the user from doing this, the class has a custom lAllowAddNew property that may be set to false. Consequently, when lAllowAddNew is set to false, the user can still enter a new item in the combo only to be told “Please select an item from the list”. This is user-surly behavior, to say the least. There is also the issue of controlling the cursor keys.
Figure 4. Form with nested objects. 14 MegaFox: 1002 Things You Wanted to Know About Extending Visual FoxPro Table 2. Tab order in different levels of containership. Object Form PageFrame Label1 TextBox1 Container Back Button Fwd Button Search Button Exit Button TabIndex 1 1 2 3 1 2 4 2 Applies to Form Page 1 Page 1 Page 1 Container Container Page 1 Form Unless you are extremely well organized in constructing your forms and classes, you will need to amend these default values to ensure that the final form actually behaves in the way that your users expect.