IfcDoc.CtlRules.toolStripButtonRuleRef_Click C# (CSharp) Method

        private void toolStripButtonRuleRef_Click(object sender, EventArgs e)
        {
            TreeNode tnSelect = this.treeViewTemplate.SelectedNode;
            DocModelRuleEntity docRule = (DocModelRuleEntity)tnSelect.Tag as DocModelRuleEntity;
            if (docRule == null)
                return;

            DocEntity docEntity = this.m_project.GetDefinition(docRule.Name) as DocEntity;
            if (docEntity == null)
                return;

            using (FormSelectTemplate form = new FormSelectTemplate(null, this.Project, docEntity))
            {
                if (form.ShowDialog(this) == DialogResult.OK && form.SelectedTemplate != null)
                {
                    // check for possible recursion
                    if(form.SelectedTemplate == this.m_template || form.SelectedTemplate.IsTemplateReferenced(this.m_template))
                    {
                        MessageBox.Show("Recursive template referencing is not supported.");
                        return;
                    }

                    docRule.References.Add(form.SelectedTemplate);

                    LoadTemplateGraph(tnSelect, docRule);
                }
            }
        }