private void analyzeButton2_Click(object sender, EventArgs e)
{
if (currentDesignOptions is ConcreteDesignOptions)
currentDesignOptions = null;
else if (currentDesignOptions is SteelDesignOptions)
currentDesignOptions = (services.Model.ConcreteDesignOptions is ConcreteDesignOptions) ?
services.Model.ConcreteDesignOptions : null;
AnalyzeButton_Click(sender, e);
}