>
>I have a problem. The Down and Up arrows images look like simple properties and don't allow me to Browse for the images as, for instance, other native image properties allow. What should I do to make them "Browsable" ?
>

It's not required - you can edit the code directly via an attribute in the ASPX file for that control. But if you really want to add it, it's done via attributes.

Add an attribute something like this to the property:

[Category("Appearance")]
[Browsable(true)]
[Bindable(false)]
[DefaultValue("")]
[PersistenceMode(PersistenceMode.Attribute)]
[Editor("System.Web.UI.Design.ImageUrlEditor", "System.Drawing.Design.UITypeEditor")]
public string PropertyNameHere
{
   get {} // Whatever
   set {}
}