After look at the js file for jazz.ui.Dialog, the center variable has this jsdoc attached to it:

/**
* Specify whether the Dialog should be positioned in the center of the window. If false, the
* consumer is responsible for appending the dialog to the DOM.
* @type Boolean
* @default true
*/
center: true,

So this means you will need to attach the dialog to the dom yourself. So your code would have to look more like:

this.dialog = new jazz.ui.Dialog({
contentNode: this.contentNode,
primaryTitle: this.messages.Notice_1,
width: this.width,
destroyContents: true,
center: false
});
this.domNode.appendChild(this.dialog);