dialog box open is changing my scrolltop position

Question

The problem is when Im scrolling down my page (e.g Yposition = 1500) and reloading my dialogPreview. The srollTop position of the page is changing to the top of the page (there is located dialog).

var yPos = document.documentElement.scrollTop || document.body.scrollTop;
$("#dialogPreview").dialog({
    title : $("#previewTitle").val(),
    resizable : false,
    width : 185,
    height : 240,
    draggable : false,
    dialogClass : "dialogPreviewClass",
    position : {
        my : "left top",
        at : "left bottom",
        of : $("#previewHandler")
    },
    open: function( event, ui ) 
    {
        document.documentElement.scrollTop = yPos;
        alert("test");
    },
    close : onCloseDialog,
    autoOpen : false
});

"open" function is running too fast. How to check if dialog is loaded and change scrollTop position in right moment and place? jquery version 1.10. On 1.9 everything was right.

Answer 1

ok, I fixed it. In first version I made simple onFocus event

focus: function( event, ui ) 
    {
        if(is_chrome){
            document.body.scrollTop = yPos;
        }else{
            document.documentElement.scrollTop = yPos;
        }
    },

where yPos was

var yPos = document.documentElement.scrollTop || document.body.scrollTop;

but my window was fast scrolled up and down. Finally I override function responsible for focusing like here

$.ui.dialog.prototype._focusTabbable = function(){};