How to display context choice popup for function in EditControl?

//To populate context choice list
private void editControl1_ContextChoiceOpen(IContextChoiceController contextChoiceController)
{
    //To add context choice items.
    contextChoiceController.Items.Add("function1", "Dummy Function 1");
    contextChoiceController.Items.Add("function2", "Dummy Function 2");
    contextChoiceController.Items.Add("function3", "Dummy Function 3");
}
 
// Populate the context prompt list on popup
private void editControl1_ContextPromptOpen(object sender, Syncfusion.Windows.Forms.Edit.ContextPromptUpdateEventArgs e)
{
    switch (this.contextPromptLexem)
    {
        case "function1":
            e.List.Clear();
            e.AddPrompt("function1(string chatText, int senderID, int receiverID, int connectionID)", "Specify the chat text, the sender information, the receiver information and the connection ID");
            e.AddPrompt("function1(string chatText, int senderID, bool isBroadCast)", "Specify the chat text, the sender information, and if its a broadcast");
            break;
        case "function2":
            e.List.Clear();
            e.AddPrompt("function2()", "Create a new database");
            e.AddPrompt("function2(string dataBaseName)", "Create a new database with the specified name");
            break;
        case "function3":
            e.List.Clear();
            e.AddPrompt("function3()", "Create a new file");
            e.AddPrompt("function3(string fileName)", "Create a new file with the specified name");
            break;
    }
}

'To populate context choice list
Private Sub editControl1_ContextChoiceOpen(ByVal contextChoiceController As IContextChoiceController) Handles editControl1.ContextChoiceOpen
 'To add context choice items.
 contextChoiceController.Items.Add("function1", "Dummy Function 1")
 contextChoiceController.Items.Add("function2", "Dummy Function 2")
 contextChoiceController.Items.Add("function3", "Dummy Function 3")
End Sub
 
' Populate the context prompt list on popup
Private Sub editControl1_ContextPromptOpen(ByVal sender As Object, ByVal e As Syncfusion.Windows.Forms.Edit.ContextPromptUpdateEventArgs) Handles editControl1.ContextPromptOpen
 Select Case Me.contextPromptLexem
  Case "function1"
   e.List.Clear()
   e.AddPrompt("function1(string chatText, int senderID, int receiverID, int connectionID)", "Specify the chat text, the sender information, the receiver information and the connection ID")
   e.AddPrompt("function1(string chatText, int senderID, bool isBroadCast)", "Specify the chat text, the sender information, and if its a broadcast")
  Case "function2"
   e.List.Clear()
   e.AddPrompt("function2()", "Create a new database")
   e.AddPrompt("function2(string dataBaseName)", "Create a new database with the specified name")
  Case "function3"
   e.List.Clear()
   e.AddPrompt("function3()", "Create a new file")
   e.AddPrompt("function3(string fileName)", "Create a new file with the specified name")
 End Select
End Sub

<!--To open the context prompt list after pressing the "(" in EditControl-->
  <lexem BeginBlock="(" EndBlock=")" Type="Operator" IsComplex="true" IsCollapsable="false" DropContextPrompt="true"
  CollapseName="(...)">
    <SubLexems>
      <lexem BeginBlock="\n" IsBeginRegex="true" />
    </SubLexems>
  </lexem>