Sitecore: Show input option after using menu context item - asp.net

Question

I've added a menu context item to the TreelistEx. This menu item sends a messages that I later catch in a HandleMessage method.
In this method i create a new item ( template type and parent item are given in the source of the treelist field ).
All i need now is a way to ask the user for a name. But i haven't been able to find a simple way to do this.
class MyTreeListEx : TreelistEx, IMessageHandler
{
void IMessageHandler.HandleMessage(Message message)
{
if (message == null)
{ return; }
if (message["id"] == null)
{ return; }
if (!message["id"].Equals(ID))
{ return; }
switch (message.Name)
{
case "treelist:edit":
// call default treelist code
case "mytreelistex:add":
// my own code to create a new item
}
}
}
Does anyone have any suggestions on how to achieve this ?
Edit: added image & code + i'm using Sitecore 8 Update 1

Answer 1

I don't know which version of Sitecore you use but what you can try is SheerResponse.Input method.
You can use it like this:
using Sitecore.Configuration;
using Sitecore.Globalization;
using Sitecore.Shell.Applications.ContentEditor.FieldTypes;
using Sitecore.Web.UI.Sheer;
void IMessageHandler.HandleMessage(Message message)
{
...
case "mytreelistex:add":
Sitecore.Context.ClientPage.Start(this, "AddItem");
break;
}
protected static void AddItem(ClientPipelineArgs args)
{
if (args.IsPostBack)
{
if (!args.HasResult)
return;
string newItemName = args.Result;
// create new item here
// if you need refresh the page:
//SheerResponse.Eval("scForm.browser.getParentWindow(scForm.browser.getFrameElement(window).ownerDocument).location.reload(true)");
}
else
{
SheerResponse.Input("Enter the name of the new item:", "New Item Default Name", Settings.ItemNameValidation,
Translate.Text("'$Input' is not a valid name."), Settings.MaxItemNameLength);
args.WaitForPostBack();
}
}
This code will even validate your new item name for incorrect characters and length.