c# - Access namespace not defined exactly in XAML -

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lets assume xaml defined below imported namespace in mycontrols. 

<grid x:class="layoutgrid"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     xmlns:sys="clr-namespace:system;assembly=mscorlib"              xmlns:mycontrols="clr-namespace:predefined.controls;assembly=uicontrols"       >

if use defined in namespace predefined.controls reference alias mycontrols

example:

<mycontrols:mycustombutton name="submitbutton" />

now if namespace predefined.controls.customtextboxes existed, there way use control inside namespace without having add xaml definition @ top?

something this??

<mycontrols.customtextboxes:mycustomtextbox name="textbox1" />

no. in xml, namespace prefix defines namespace, can't tack things onto it. you'll need add full clr namespace xml namespace declaration in parent element:

xmlns:ctb="clr-namespace:predefined.controls.customtextboxes;assembly=uicontrols"

and use prefix in when instantiate element/control in xaml:

<ctb:mycustomtextbox />

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