Have you had a look into the umbracoLog table to see if there are any messages corresponding with the problem?

Nothing in the error log.

I took the .cs file out of the old DLL and placed it into it's own project...and now it seems to be working perfectly.

-C

I am having problems with this also. I have two controls in the same project, one for displaying a drop down list, the other the exact copy of the numeric control inside Umbraco. Neither work correctly.

Drop Down List control:
using System;
using System.Web.UI.WebControls;
using umbraco.interfaces;

namespace Odin.Umbraco.Modules.Selectors {
    public class Destinations : System.Web.UI.WebControls.DropDownList, IMacroGuiRendering {

        string _value = "";

        public bool ShowCaption {
            get { return true; }
        }

        public string Value {
            get {
                return base.SelectedValue;
            }
            set {
                this.SelectedValue = value;
                _value = value;
            }
        }

        protected override void OnInit(EventArgs e) {
            base.OnInit (e);
            this.CssClass = "guiInputTextStandard";
            this.Attributes.Add("style", "width: 30%");
            this.Items.Add(new ListItem("-- select destination --", "0"));
            this.Items.Add(new ListItem("London", "1"));
            this.Items.Add(new ListItem("San Fransisco", "2"));
        }

        public Destinations() {}
    }
}

I registered the module like this into the DB:
insert into cmsMacroPropertyType (
    macroPropertyTypeAlias, macroPropertyTypeRenderAssembly, macroPropertyTypeRenderType, macroPropertyTypeBaseType
) values (
    'destinationDropDownList', 'Odin.Umbraco.Modules.Selectors', 'Destinations', 'String'
)

I see the parameter type when I go into Developer > Macros > My Macro > Parameters tab. But when I try to put the macro onto a page, the only parameter showing up is the text parameter that ships by default from Umbraco.

What the hell am I doing wrong ?

We are evaluating this system, and this is the ONLY thing that I have left on my check-list. If we can do this, we can use the system ...

I think that you mixed up Assmebly and typename. Try insert Odin  into  macroPropertyTypeRenderAssembly and Umbraco.Modules.Selectors.Destinations  or Odin.Umbraco.Modules.Selectors.Destinations in macroPropertyTypeBaseType

Hope it helps you,

Richard

@Arni, I was having the same problem with namespaces.

Richard is correct. 

Odin into macroPropertyTypeRenderAssembly

Umbraco.Modules.Selectors.Destination into macroPropertyTypeRenderType

Using the fully qualified name in the macroPropertyTypeRenderType column didn't work for me.  I had to separate the assembly from the full namespace.

I've just been struggling with this one, and came to this:

1: Your class must have an empty constructor: eg new Destination(). If you don't have any other constructor you don't need to do this.

2: You cannot override OnInit, you must override OnLoad to add controls

Also, it's a bit confusing what to register in the database, the render type does not allow you to add the full namespace path.
So, If your assembly is My.Assembly and your namespace + class is My.Assembly.Controls.EditControl the type should be Controls.EditControl

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