Incremental Search Textbox Class in Visual Foxpro

This specialized textbox class is a substitute for incremental searching in a grid.  It needs to be placed on a form  at the same level of the containership hierarchy as the grid, and there can be only one grid at that level.

This class will find the grid, regardless of its name, and will perform a search based on the current sort order.

* There must be a tag set on the current table, and the current table must be the grid's recordsource.  (This class will  not change the selected table).

* After each change of this textbox's value, focus is set to the grid and then back to the textbox.  This is so that the record pointer of the grid will reflect any record pointer changes.

* This textbox overrides the When code in the standard textbox (see comment in When method).

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