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<com:TForm ID="form1">
<h1>Callback Enabled Calculator</h1>
<com:TActiveTextBox id="a" />
+
<com:TActiveTextBox id="b" />
=
<com:TActiveTextBox id="c" />
<com:TActiveButton id="sum"
onclick="do_sum"
text="Calculate!" />
<com:TRequiredFieldValidator
ControlToValidate="a"
ErrorMessage="left summand is required."
ControlCssClass="required"
Display="None" />
<com:TRequiredFieldValidator
ControlToValidate="b"
ErrorMessage="right summand is requied."
ControlCssClass="required"
Display="None" />
<div class="summarybox">
<com:TValidationSummary
ID="summary"
HeaderText="Unable to calculate because" />
</div>
</com:TForm>
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