c# - WPF DataGridTemplateColumn Width="*" Header too wide -

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i trying assign width of each of datagridtemplatecolumn in datagrid using "*".

<datagrid  name="mapping" horizontalalignment="stretch" verticalalignment="stretch" margin="1"                        itemssource="{binding information.signals}"               selectionmode="single"  autogeneratecolumns="false" virtualizingpanel.isvirtualizing="true" fontsize="10"               rowdetailsvisibilitymode="visiblewhenselected" borderthickness="1"                 enablecolumnvirtualization="true" enablerowvirtualization="true" scrollviewer.verticalscrollbarvisibility="auto" scrollviewer.isdeferredscrollingenabled="true"              scrollviewer.cancontentscroll ="true" virtualizingpanel.virtualizationmode="recycling"              canuseraddrows="true" canuserresizerows="false" canuserdeleterows="true"  selectionunit="fullrow"              scrollviewer.horizontalscrollbarvisibility="auto"            >     <datagrid.columns>         <datagridtemplatecolumn header="name"                                 celltemplate="{staticresource nametemplate}"                                  canusersort="true" canuserreorder="false" canuserresize="true" sortmemberpath="name"                                                                                                            width="6*"                                 >         </datagridtemplatecolumn>         <datagridtemplatecolumn header="type"                                  celltemplate="{staticresource propertytemplate}"                                  canusersort="true" canuserreorder="false" canuserresize="true"  sortmemberpath="selectedproperty"                                                                     width="4*">         </datagridtemplatecolumn>

and columntemplates similar one

        <datatemplate x:key="nametemplate">             <grid horizontalalignment="stretch" verticalalignment="center">                 <textblock text="{binding path=name}" minwidth="280" fontsize="11" fontfamily="calibri"                                          horizontalalignment="stretch" verticalalignment="center"/>             </grid>         </datatemplate>

when window maximized scaling works fine. happens when not maximized, header 3 monitors wide, 3000 pixels.

if set width fixed value fine well. suggest me how tackle problem? use relative scaling using "*"

update: wpf project using mahapps controls, not sure if reason.

width , height when applied using "*" measured on count of "1". whenever divide screen has divided such 1 full part being divided.

using 4* , 6* incorrect. use 0.4* , 0.6* instead, sums one.


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