//</Snippet3>
// Function for the callbacks to call
public bool DoFormat(object arg)
{
// Get a reference to the designer's associated component
SampleControl ctl = (SampleControl)_parent.Component;
// Get the format name from the arg
string fmt = (string)arg;
// Create property descriptors
PropertyDescriptor widthProp = TypeDescriptor.GetProperties(ctl)["BoxWidth"];
PropertyDescriptor backColorProp = TypeDescriptor.GetProperties(ctl)["BackColor"];
// For the selected format, set two properties
switch (fmt)
{
case "FormatWide":
widthProp.SetValue(ctl, Unit.Pixel(250));
backColorProp.SetValue(ctl, Color.LightBlue);
break;
case "FormatNarrow":
widthProp.SetValue(ctl, Unit.Pixel(100));
backColorProp.SetValue(ctl, Color.LightCoral);
break;
case "FormatMedium":
widthProp.SetValue(ctl, Unit.Pixel(150));
backColorProp.SetValue(ctl, Color.White);
break;
}
_parent.UpdateDesignTimeHtml();
// Return an indication of success
return(true);
}
// Callback for the narrow format
public void FormatNarrow()
{
SampleControl ctrl = (SampleControl)_parent.Component;
// Create the callback
TransactedChangeCallback toCall = new TransactedChangeCallback(DoFormat);
// Create the transacted change in the control
ControlDesigner.InvokeTransactedChange(ctrl, toCall, "FormatNarrow", "Use a narrow format");
}