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    <p>The complete project answer is good. But this is an alternate answer showing how to do what you want, in a form you already have.</p> <p>Go into your form, and go to the interface section, in the types area, outside your form's class definition and add a type:</p> <pre><code> interface type TMyEvent = procedure(Sender:TObject;Param1,Param2,Param3:Integer) of object; TMyForm = class(TForm) .... </code></pre> <p>It is traditional, but not required, that the first item in your event be the object sending it, but to use base class TObject instead of your form's actual class type.<br> The other parameters above are not required at all, but are showing you how you would declare your own additional data. if you don't need them, then just use Sender:TObject. And in that case, you don't have to define TMyEvent at all, just use the TNotifyEvent type.</p> <p>Now declare a field that uses that type, in your form:</p> <pre><code>TMyForm = class(TForm) private FMyEvent : TMyEvent; ... </code></pre> <p>Now declare a property that accesses that field, in your form's properties section:</p> <pre><code> // this goes inside the class definition just before the final closing end property MyEvent:TMyEvent read FMyEvent write FMyEvent </code></pre> <p>Now go to where you want that event to 'fire' (get called if it is set) and write this:</p> <pre><code>// this goes inside a procedure or function, where you need to "fire" the event. procedure TMyForm.DoSomething; begin ... if Assigned(FMyEvent) then FMyEvent(Self,Param1,Param2,Param3); end; </code></pre>
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    1. PODelphi event handling, how to create own event
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    1. COThanks Warren; I shall try to do something with delphi, actually the problem is , flow of program, either I need to define and call the event in a single unit or it takes an other unit to define the Event and Assign properties and then call this event with a button click event. Like progressbar and percentage counter.
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    2. COI have no idea what you mean. It's best if you ask a different question, if you are still not clear.
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