I have found problem and solution in bootstrap.css file.
When the link have class=”modal” like
<blockquote><a class=”modal” title=”Something” href=”something?tmpl=component” rel=”{handler: ‘iframe’, size: {x: 650, y: 375}}”>Something</a></blockquote>
Then modal class from bootstrap.css are used to handle it and every link is centered on the page, with white rounded box as the css class describe below
<blockquote>.modal {
position: fixed;
top: 50%;
left: 50%;
z-index: 1050;
width: 560px;
margin: -250px 0 0 -280px;
background-color: #fff
border: 1px solid #999
border: 1px solid rgba(0,0,0,0.3);
*border: 1px solid #999
-webkit-border-radius: 6px;
-moz-border-radius: 6px;
border-radius: 6px;
-webkit-box-shadow: 0 3px 7px rgba(0,0,0,0.3);
-moz-box-shadow: 0 3px 7px rgba(0,0,0,0.3);
box-shadow: 0 3px 7px rgba(0,0,0,0.3);
-webkit-background-clip: padding-box;
-moz-background-clip: padding-box;
background-clip: padding-box;
outline: none;
}</blockquote>
To resolve it i just delete whole .modal class parameters and i left only one thing
<blockquote>background-color: none;</blockquote>
Now it works 😉
Regards!