If you take a look inside EditAttributes() method, it generates list of key/value pairs for EPiServer OnPage edit mode to understand which html element represents which PageType property. I haven't seen feature to add more than one EditAttributes() to the html element - to edit more than one PageType property.

To make this a good experience for the editor I think I would create a ButtonWrapperBlock and make your ButtonBlock local only (with AvailableInEditMode=false). Something like this:

[ContentType(DisplayName = "ButtonLocalBlock", GUID = "bc29dc00-46d4-48fc-8fdc-a7ffa2008313", Description = "", AvailableInEditMode = false)]
public class ButtonBlock : BlockData
{
    [Display(Order = 1, GroupName = SystemTabNames.Content)]
    public virtual string ButtonText { get; set; }
 
    [Display(Order = 2, GroupName = SystemTabNames.Content)]
    public virtual Url ButtonLink { get; set; }

    [Display(Order = 3, GroupName = SystemTabNames.Content)]    [SelectOne(SelectionFactoryType=typeof(ButtonSelectionFactory))]
    public virtual string ButtonType { get; set; }
}

[ContentType(DisplayName = "ButtonBlock", GUID = "3039ab13-4cdb-46bc-85a6-3910bc5e4819")]
public class ButtonWrapperBlock : BlockData
{
    [Display(Name = "Button")]
    public virtual ButtonBlock Button { get; set; }
}

Then your ButtonBlock view would look like this:

@using EPiServer.Web.Mvc.Html
@model MyEPiServerSiteMVC.Models.Blocks.ButtonBlock

<a class="@Model.ButtonType" title="@Model.ButtonText" href="@Url.ContentUrl(Model.ButtonLink)">
    @(string.IsNullOrWhiteSpace(Model.ButtonText) ? Html.Translate("/blocks/buttonblockcontrol/buttondefaulttext") : Model.ButtonText)
</a>

And your ButtonWrapperBlock view would look like this:

@using EPiServer.Web.Mvc.Html
@model MyEPiServerSiteMvc.Models.Blocks.ButtonWrapperBlock

@Html.PropertyFor(m => m.Button)

This will lead to a popup dialog when the editor clicks the button and he/she can set all the button properties all together.

Hello, Mattias Olsson

I have changed the markup in the class to @Model.ButtonType just before you posted this and my button is now showing up. I have implimented the wrapper as you have sugguested and I am getting nothing showing for my button in edit and as well as preview mode. I copied the code exactly. Is there something missing?

Do you have these files?

/Views/Shared/ButtonBlock.cshtml
/Views/Shared/ButtonWrapperBlock.cshtml

And you have created a new instance of the new ButtonWrapperBlock? If yes, it's strange it is not working.

I had buttonblock.cshtml in /views/blocks

and buttonwrapperblock.cshtml in /views/shared

so they both need to bein shared then?

I now have both in shared.

This made two block types in the menu when creating a new block. I chose the wrapper. I entered the setting and the block displayed in my content area. Clicking on the block did not render a popup editor but instead the normal editor in it's own page. I am not using the alloy site but have started from an empy project.