I am trying to create a VF page on which custom components are displayed which are stored in Custom setting or metadata object. So that I can give controll to end user which component they want to see. 

To achieve this I choosed to work with apex:DynamicComponent, I tried different ways but the only i am succesfull when I user {!piechart} for component value. 

<apex:page controller="DashboardCTRL" sidebar="false" >


    
    <apex:repeat value="{!count}" var="i" >
      
        <apex:dynamicComponent componentValue="{!cmps[i]}"/>
      
    </apex:repeat>

*********** or ******************

  <apex:repeat value="{!cmps}" var="cmp" >
      
        <apex:dynamicComponent componentValue="{!cmp}"/>
      
    </apex:repeat>

*************************************

    
</apex:page>


********************* Controller ******************************************

public class DashboardCTRL {

   
    public  ApexPages.Component piechart { get; set; }
    public Map<String,ApexPages.Component> cmps{get;set;}
    
    public List<integer> count{get;set;}

    public DashboardCTRL() {
      cmps = new Map<String, ApexPages.Component>();
      count = new list<integer>();  
    /*    Type t = Type.forName('PieChartCtrl');
        
        System.debug('t is :'+ t);
        
        if(t != null) {
          IComponentProvider cprovider = (IComponentProvider)t.newInstance();
        
        
         nudebt__Dashboard_Settings__c usersettings = nudebt__Dashboard_Settings__c.getInstance(UserInfo.getUserId());
        
       Map<string,Schema.SObjectField> settingFields = Utility.getsObjectFieldMap('nudebt__Dashboard_Settings__c');
        
       List<ApexPages.Component> DashboardList = new List<ApexPages.Component>(); 
        
        integer i = 0; 
        for(string k: settingFields.keySet()){
            
            string fname = settingFields.get(k).getDescribe().getName();
            System.debug('fieldname '+ fname);
            if(fname.startsWith('nudebt__cmp')){
                
                System.debug('component name is'+ usersettings.get(fname));
                
                Type t1 = Type.forName((string)usersettings.get(fname));
        
                System.debug('t is :'+ t1);
        
                if(t1 != null) {
                  IComponentProvider cprovider = (IComponentProvider)t1.newInstance();
                   DashboardList.add(cprovider.provideComponent());
                    this.piechart = cprovider.provideComponent();
                   cmps.put(String.valueOf(i),this.piechart);
                    count.add(i);
                    i++;
                }
            }
        }
    }
    
 
   
}