Is it possible to implement your own markup extension in WinRT? - xaml

I'm trying to implement my own markup extension, it would be something that could be used to pass two values to a property like:
{Foo Value1={x:Null} Value2={x:Null}}
I've looked into some websites and there is always someone saying something about extending the MarkupExtension class. I've tried to do the same within a Windows Phone 8.1 project and this class doesn't seen to be available. Can someone point me to the right direction? What should I do to implement something like that? There is a better alternative to extending the MarkupExtension class?
Thanks in advance.

It is not possible, no. Very sorry to be the bearer of bad news.

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How do I customize SDCAlertView when using it in an Objective-C class

I am using SDCAlertview in a project, that is being developed in Objective-C, and I would like to be able to set the visual style but I am unable to do so.
The only file that I am able to import into any other obj-c class is SDCAlertView-Swift.h and that does not give me any options to set the visual style.
I have seen code samples, in swift, that are able to do this.
Can someone help me out here?
Thank You.
There was a problem with exposing this API to Objective-C. That's fixed in https://github.com/sberrevoets/SDCAlertView/commit/3f26a7851e1022e5aa65328ce9f36c63cdcb371a. This is not in master yet, but I plan on releasing an update in the next week or so.

Login/post to WordPress using Objective-C?

I checked out their API, but I didn't recognize anything, and saw nothing for Objective-C. Could someone guide me in the right path? Thanks in advance!
WordPress doesn't have any specific Objective-C library as far as I know. It implements a few XML-RPC interfaces, so you'll just want to get an Objective-C XML-RPC library and talk to it through that.
You can check out the source code for their iOS app too if you want to see how they do it as well.
http://ios.wordpress.org/development/

How to create UI tags in Cocoa Objective-c?

I'm looking into building a tagging feature in my Mac app. I would like to do something like in the attached image. Is the UI portion offered natively in Cocoa? If so, what is the class name?
You can use NSTokenField to accomplish that. Start by reading Token Field Programming Guide.
I had to do exactly that a couple of weeks ago. I decided to use NSTokenField as well but ran into quite a number of problems. See my endeavours here. Hope you fare better with your implementation as it gave me a couple of really short nights....

Objective-C and designing a plugin mechanism

I need to design a simple plugin system in Objective C. I would like some advice about how to go about this. Thanks!
Cocoa is your girlfriend: http://www.cimgf.com/2008/09/17/cocoa-tutorial-adding-plugins-to-a-cocoa-application/
Awesome tutorial.
There is always going to the Source. Here is the ADC reference to Plug-ins
There are dozens of ways you could do this, so you might need to elaborate a little on what exactly you're trying to achieve. As a starting point, I'd recommend you look into Cocoa delegates which are usually a great way to integrate new code into an existing framework.

Creating a proxy for IE (or other browsers)

I'm using VB.net. I need to create an application that sits in between the browser and the actual internet. Basically, I'm creating an online game that will edit some webpages that are incoming so that they contain parts of the game (it's a kind of scavenger hunt). How would I create this?
Does anybody have any ideas for this? I've found nothing online. If you do know something about this, I prefer code examples and not just subjects. I tend to need big pushes in a direction to learn something new.
Thanks if you can!
Your best bet is to start with FiddlerCore, which is a .NET Class Library which provides exactly what you're looking for. http://fiddler.wikidot.com/fiddlercore