Which Layout would I take when I want to fit a form in a window - extjs

Question

I have multiple forms and want to use one Window class to view them. Now it happens that all forms have a different size and I don't want to manage all of them so I thought about the 'fit' layout along with a min/max wight/height for the Window.
But that would be to easy, if I have applied dockedItems the layout messed up along with error that the layout failed. Whatever this error is supposed to tell me... But OK I googled and found out that I need to define a height and a width to make this error go away along with a new special property called: shrinkWrapDock which should tell the layout to depend on the size of content.
So again my Question
Which Layout would I take when I want to auto fit a form in a window while the window has a max-/min-size?
Edit
It don't has to be strictly a form, it is just Ext.window.Window configured with a 'fit' layout which should maintain a min / max size for itself. So a very small item within the window may have unused space while a very large one get scrolbars. All in between the min/max of the window are scalled exactly.
e.g.
// lets say we have a window configured like this
{
xtype:'window',
minHeight: 50,
maxHeight: 500,
layout: 'fit'
}
To small form -> adding a form with just one textfield.
Window uses minHeight: 50 because one field has only a height of ~40 px
Fit within min/max -> adding a form with 6 textfields.
Windows scales to size required by the form ~ 240px
To height form -> adding a form with 20 textfields
Window uses maxHeight: 500 because 20 field has a height of ~800 px

Answer 1

Use a panel inside window(which has fix max,min ht wdt) as parent container, use flex property for it items i.e your multiple forms
eg :
{
xtype:'panel',
itemId:'somePanelId',
layout :'fit',
items :[
{
xtype :'form',
flex : 2,
items [{..}]
},
{
xtype :'form',
flex : 3,
items [{..}]
}
}
Try different combinations of flex for each form as per each form's size. While giving flex consider as fix number say '5' here as outof i.e 2/5 size for form1 and 3/5 (three out of 5) space for form2.