It will help us to better understand the cause of the issue.
This may not result in an immediate fix for your individual issue, but it will go directly towards getting this sort of issue fixed in general.
This type of event is mainly used for iterating code at a tick rate of 120Hz.
First of all, it should be defined in your Main constructor for it to be called, otherwise it wouldn't be initiated at all!
Or do the Fad In work manually just like what I have done in the sample below. I think the Update Panel Animation Extender is still full of bugs and not usable in many cases. This causes panel 2 to fade out and disappear and it never comes back because the On Updated event is never fired. If you have two update seperate panels and only want an animation on one you cannot.
Either both events need to fire or neither event needs to fire. Lets take this simple animation which is targeted at Update Panel2 If Update Panel 1 updaes it will fire the On Updating animation for Update Panel 2 even though the panels updatemode is declared as conditional.
To resolve this , you can set the Update Panel1's Update Mode to "Always". But trying to add other update panels makes things work erracticaly. Lets take this simple animation which is targeted at Update Panel2 If Update Panel 1 updaes it will fire the On Updating animation for Update Panel 2 even though the panels updatemode is declared as conditional.It also enables you to set up data repositories and manipulate the data model prior to rendering the content item.Typically, you define a handler for a content part by creating a class that inherits from class is a base class that provides the methods and properties you will commonly need when defining your own content handler. NET AJAX Control Toolkit is not just a control but a whole framework to add animations to a control.For the contents of an Update Panel, a special extender exists that relies heavily on the animation framework: Update Panel Animation.