iframeElement = function( dialog, elementDefinition, htmlList )
			{
				if ( arguments.length < 3 )
					return;

				var _ = ( this._ || ( this._ = {} ) ),
					contentLoad = elementDefinition.onContentLoad && CKEDITOR.tools.bind( elementDefinition.onContentLoad, this ),
					cssWidth = CKEDITOR.tools.cssLength( elementDefinition.width ),
					cssHeight = CKEDITOR.tools.cssLength( elementDefinition.height );
				_.frameId = CKEDITOR.tools.getNextNumber() + '_iframe';

				// IE BUG: Parent container does not resize to contain the iframe automatically.
				dialog.on( 'load', function()
					{
						var iframe = CKEDITOR.document.getById( _.frameId ),
							parentContainer = iframe.getParent();

						parentContainer.setStyles(
							{
								width : cssWidth,
								height : cssHeight
							} );
					} );

				var attributes =
				{
					src : '%2',
					id : _.frameId,
					frameborder : 0,
					allowtransparency : true
				};
				var myHtml = [];

				if ( typeof( elementDefinition.onContentLoad ) == 'function' )
					attributes.onload = 'CKEDITOR.tools.callFunction(%1);';

				CKEDITOR.ui.dialog.uiElement.call( this, dialog, elementDefinition, myHtml, 'iframe',
						{
							width : cssWidth,
							height : cssHeight
						}, attributes, '' );

				// Put a placeholder for the first time.
				htmlList.push( '<div style="width:' + cssWidth + ';height:' + cssHeight + ';" id="' + this.domId + '"></div>' );

				// Iframe elements should be refreshed whenever it is shown.
				myHtml = myHtml.join( '' );
				dialog.on( 'show', function()
					{
						var iframe = CKEDITOR.document.getById( _.frameId ),
							parentContainer = iframe.getParent(),
							callIndex = CKEDITOR.tools.addFunction( contentLoad ),
							html = myHtml.replace( '%1', callIndex ).replace( '%2', CKEDITOR.tools.htmlEncode( elementDefinition.src ) );
						parentContainer.setHtml( html );
					} );
			}
An iframe element.
@extends CKEDITOR.ui.dialog.uiElement
@example
@constructor
@param {CKEDITOR.dialog} dialog
Parent dialog object.
@param {CKEDITOR.dialog.uiElementDefinition} elementDefinition
The element definition. Accepted fields:
<ul>
	<li><strong>src</strong> (Required) The src field of the iframe. </li>
	<li><strong>width</strong> (Required) The iframe's width.</li>
	<li><strong>height</strong> (Required) The iframe's height.</li>
	<li><strong>onContentLoad</strong> (Optional) A function to be executed
	after the iframe's contents has finished loading.</li>
</ul>
@param {Array} htmlList
List of HTML code to output to.