A String expression that indicates the control's text
Use the Text property to specify the control's text. The
control's text is evaluated using arithmetic operators. Use the Result
property to get the result, if the expression is valid. Use the IsValid
property to specify whether the Text property is syntactically correct, and
may be evaluated. The result is displayed as the user types
the expression. The control handles double constants and arithmetic operations
like +( addition ), - ( subtraction ), / ( division ), or * ( multiply ). To
enforce a priority, you can use parentheses (). The control fires the Change
event when the user alters the expression. Use the SelText
property to retrieve the selected text. Use the FormatNumbers
property to specify the HTML format for the numbers, and the FormatResult
to specify the HTML format for the result being displayed while editing,
