private void OnButtonClick(object sender, EventArgs e)
{
switch (((Button)sender).Name)
{
case "btnTest":
TestExpression();
break;
case "btnClear":
textQuery.Clear();
break;
case "btnShowValues":
break;
case "btnCancel":
Close();
break;
case "btnOk":
if (TestExpression())
{
_layersHandler.VisibilityExpression(textQuery.Text, ExpressionTarget);
Close();
}
break;
}
}