You need to create a custom macro property type see http://www.richardsoeteman.net/2010/01/04/CreateACustomMacroParameterType.aspx on how to do this.

Regards

Ismial 

Hi, Thanks for your reply. I visited the link that you provided and followed the steps. Now, the problem arises I've DropDownList with value 1 and 2. if I select 2 and click ok it's not retaining it again shows 1. What should I do to make this retain it's value.

While working on an older installation (4.11.10) I ran in to this issue so I thought I'd just share my findings.

And it seems that the set method of Value is called before the items are added. Therefore, you need to add the items before calling this.SelectedValue = value;.

I added a private method to call in the constructor and in the set method.

public string Value
{
    get
    {
        return this.SelectedValue;
    }
    set
    {
        AddItems();
        this.SelectedValue = value;
    }
}
private bool ItemsAdded
{
    get
    {
        return this.Items.Count > 0;
    }
}
private void AddItems()
{
    if (!ItemsAdded)
    {
        this.Items.Add(new ListItem("Text 1", "Value1"));
        this.Items.Add(new ListItem("Text 2", "Value2"));
    }
}

Otherwise, my code is similar to the code on this page: http://www.richardsoeteman.net/2010/01/04/CreateACustomMacroParameterType.aspx

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